Just installed TOTO Drake CST743 (replacing an old toilet, not Toto). Hooked up the water, turned on the supply, heard a slight rush of water very briefly. No water comes into the tank. The pressure in the pressure tank at this point is 50 psi (I just used a tire pressure gauge to the side of the pressure tank...did NOT drain out all water from pipes with pump off, and then turn pump on to check pressure etc) Any idea how I should proceed from here? Thanks.